How are essential oils and hydrosols(essence) made?

There are a few ways to extract essential oils but below is a video using the Steam Distillation Method. The essential oils are purified oils from the plant and the essence or hydrosol is the purified water from the extraction process. Extracting essential oils and hydrosols has been going on for thousands of years! Here is a link with some good information about the history of essential oil production. How Are Essential Oils Extracted?
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